Fix a bug in patrole documentation.

Closes-Bug: 1752673
Change-Id: Ie0d4f653d6b036d072b2307ed7859d406c17aa97
diff --git a/doc/source/installation.rst b/doc/source/installation.rst
index c244152..b9cc924 100644
--- a/doc/source/installation.rst
+++ b/doc/source/installation.rst
@@ -10,12 +10,13 @@
 At the command line::
 
     $ git clone http://git.openstack.org/openstack/patrole
-    $ sudo pip install patrole
+    $ sudo pip install ./patrole
 
 Or, if you have virtualenvwrapper installed::
 
-    $ mkvirtualenv patrole
-    $ sudo pip install patrole
+    $ mkvirtualenv patrole_env
+    $ workon patrole_env
+    $ pip install ./patrole
 
 Or to install from the source::